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46d29e70 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* | |
17 | $Log$ | |
b9d0a01d | 18 | Revision 1.8.10.2 2002/07/24 10:09:31 alibrary |
19 | Updating VirtualMC | |
20 | ||
21 | Revision 1.11 2002/06/13 12:09:58 hristov | |
22 | Minor corrections | |
23 | ||
ca6c93d6 | 24 | Revision 1.10 2002/06/12 09:54:35 cblume |
25 | Update of tracking code provided by Sergei | |
26 | ||
0a29d0f1 | 27 | Revision 1.8 2001/05/30 12:17:47 hristov |
28 | Loop variables declared once | |
29 | ||
3ab6f951 | 30 | Revision 1.7 2001/05/28 17:07:58 hristov |
31 | Last minute changes; ExB correction in AliTRDclusterizerV1; taking into account of material in G10 TEC frames and material between TEC planes (C.Blume,S.Sedykh) | |
32 | ||
2a941f4e | 33 | Revision 1.4 2000/12/08 16:07:02 cblume |
34 | Update of the tracking by Sergei | |
35 | ||
bbf92647 | 36 | Revision 1.3 2000/10/15 23:40:01 cblume |
37 | Remove AliTRDconst | |
38 | ||
0e9c2ad5 | 39 | Revision 1.2 2000/10/06 16:49:46 cblume |
40 | Made Getters const | |
41 | ||
46d29e70 | 42 | Revision 1.1.2.1 2000/09/22 14:47:52 cblume |
43 | Add the tracking code | |
44 | ||
45 | */ | |
46 | ||
47 | #include <iostream.h> | |
5443e65e | 48 | #include <TObject.h> |
46d29e70 | 49 | |
46d29e70 | 50 | #include "AliTRDgeometry.h" |
51 | #include "AliTRDcluster.h" | |
52 | #include "AliTRDtrack.h" | |
5443e65e | 53 | #include "../TPC/AliTPCtrack.h" |
46d29e70 | 54 | |
55 | ClassImp(AliTRDtrack) | |
56 | ||
57 | ||
58 | //_____________________________________________________________________________ | |
59 | ||
a819a5f7 | 60 | AliTRDtrack::AliTRDtrack(const AliTRDcluster *c, UInt_t index, |
5443e65e | 61 | const Double_t xx[5], const Double_t cc[15], |
62 | Double_t xref, Double_t alpha) : AliKalmanTrack() { | |
46d29e70 | 63 | //----------------------------------------------------------------- |
64 | // This is the main track constructor. | |
65 | //----------------------------------------------------------------- | |
5443e65e | 66 | |
67 | fSeedLab = -1; | |
46d29e70 | 68 | |
69 | fAlpha=alpha; | |
5443e65e | 70 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); |
71 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
72 | ||
46d29e70 | 73 | fX=xref; |
74 | ||
75 | fY=xx[0]; fZ=xx[1]; fC=xx[2]; fE=xx[3]; fT=xx[4]; | |
76 | ||
77 | fCyy=cc[0]; | |
78 | fCzy=cc[1]; fCzz=cc[2]; | |
79 | fCcy=cc[3]; fCcz=cc[4]; fCcc=cc[5]; | |
80 | fCey=cc[6]; fCez=cc[7]; fCec=cc[8]; fCee=cc[9]; | |
81 | fCty=cc[10]; fCtz=cc[11]; fCtc=cc[12]; fCte=cc[13]; fCtt=cc[14]; | |
82 | ||
5443e65e | 83 | fIndex[0]=index; |
84 | SetNumberOfClusters(1); | |
85 | ||
86 | fdEdx=0.; | |
a2b90f83 | 87 | |
5443e65e | 88 | Double_t q = TMath::Abs(c->GetQ()); |
a819a5f7 | 89 | Double_t s = fX*fC - fE, t=fT; |
5443e65e | 90 | if(s*s < 1) q *= TMath::Sqrt((1-s*s)/(1+t*t)); |
91 | ||
92 | fdQdl[0] = q; | |
46d29e70 | 93 | } |
94 | ||
95 | //_____________________________________________________________________________ | |
5443e65e | 96 | AliTRDtrack::AliTRDtrack(const AliTRDtrack& t) : AliKalmanTrack(t) { |
46d29e70 | 97 | // |
98 | // Copy constructor. | |
99 | // | |
100 | ||
5443e65e | 101 | SetLabel(t.GetLabel()); |
102 | fSeedLab=t.GetSeedLabel(); | |
46d29e70 | 103 | |
5443e65e | 104 | SetChi2(t.GetChi2()); |
46d29e70 | 105 | fdEdx=t.fdEdx; |
106 | ||
107 | fAlpha=t.fAlpha; | |
108 | fX=t.fX; | |
109 | ||
110 | fY=t.fY; fZ=t.fZ; fC=t.fC; fE=t.fE; fT=t.fT; | |
111 | ||
112 | fCyy=t.fCyy; | |
113 | fCzy=t.fCzy; fCzz=t.fCzz; | |
114 | fCcy=t.fCcy; fCcz=t.fCcz; fCcc=t.fCcc; | |
115 | fCey=t.fCey; fCez=t.fCez; fCec=t.fCec; fCee=t.fCee; | |
116 | fCty=t.fCty; fCtz=t.fCtz; fCtc=t.fCtc; fCte=t.fCte; fCtt=t.fCtt; | |
117 | ||
5443e65e | 118 | Int_t n=t.GetNumberOfClusters(); |
119 | SetNumberOfClusters(n); | |
120 | for (Int_t i=0; i<n; i++) { | |
a819a5f7 | 121 | fIndex[i]=t.fIndex[i]; |
122 | fdQdl[i]=t.fdQdl[i]; | |
123 | } | |
5443e65e | 124 | } |
125 | ||
126 | //_____________________________________________________________________________ | |
127 | AliTRDtrack::AliTRDtrack(const AliKalmanTrack& t, Double_t alpha) { | |
128 | // | |
129 | // Constructor from AliTPCtrack or AliITStrack . | |
130 | // | |
131 | ||
132 | SetLabel(t.GetLabel()); | |
133 | SetChi2(0.); | |
134 | SetNumberOfClusters(0); | |
135 | ||
136 | fdEdx=0; | |
137 | ||
138 | fAlpha = alpha; | |
139 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
140 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
141 | ||
142 | Double_t x, p[5]; t.GetExternalParameters(x,p); | |
143 | ||
144 | fX=x; | |
145 | ||
146 | x = GetConvConst(); | |
147 | ||
148 | fY=p[0]; fZ=p[1]; fC=p[4]/x; | |
149 | fE=fX*fC-p[2]; fT=p[3]; | |
150 | ||
151 | //Conversion of the covariance matrix | |
152 | Double_t c[15]; t.GetExternalCovariance(c); | |
153 | ||
154 | c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x; | |
155 | ||
156 | Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5]; | |
157 | Double_t c32=fX*c[13] - c[8]; | |
158 | Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12]; | |
159 | ||
160 | fCyy=c[0 ]; | |
161 | fCzy=c[1 ]; fCzz=c[2 ]; | |
162 | fCcy=c[10]; fCcz=c[11]; fCcc=c[14]; | |
163 | fCey=c20; fCez=c21; fCec=c42; fCee=c22; | |
164 | fCty=c[6 ]; fCtz=c[7 ]; fCtc=c[13]; fCte=c32; fCtt=c[9 ]; | |
165 | ||
166 | } | |
167 | ||
168 | //____________________________________________________________________________ | |
169 | void AliTRDtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const { | |
170 | // | |
171 | // This function returns external TRD track representation | |
172 | // | |
173 | xr=fX; | |
174 | x[0]=GetY(); | |
175 | x[1]=GetZ(); | |
176 | x[2]=GetSnp(); | |
177 | x[3]=GetTgl(); | |
178 | x[4]=fC*GetConvConst(); | |
179 | } | |
180 | ||
181 | //_____________________________________________________________________________ | |
182 | void AliTRDtrack::GetExternalCovariance(Double_t cc[15]) const { | |
183 | // | |
184 | // This function returns external representation of the covriance matrix. | |
185 | // | |
186 | Double_t a=GetConvConst(); | |
187 | ||
188 | Double_t c22=fX*fX*fCcc-2*fX*fCec+fCee; | |
189 | Double_t c32=fX*fCtc-fCte; | |
190 | Double_t c20=fX*fCcy-fCey, c21=fX*fCcz-fCez, c42=fX*fCcc-fCec; | |
191 | ||
192 | cc[0 ]=fCyy; | |
193 | cc[1 ]=fCzy; cc[2 ]=fCzz; | |
194 | cc[3 ]=c20; cc[4 ]=c21; cc[5 ]=c22; | |
195 | cc[6 ]=fCty; cc[7 ]=fCtz; cc[8 ]=c32; cc[9 ]=fCtt; | |
196 | cc[10]=fCcy*a; cc[11]=fCcz*a; cc[12]=c42*a; cc[13]=fCtc*a; cc[14]=fCcc*a*a; | |
197 | } | |
198 | ||
46d29e70 | 199 | |
200 | //_____________________________________________________________________________ | |
201 | void AliTRDtrack::GetCovariance(Double_t cc[15]) const { | |
202 | cc[0]=fCyy; | |
203 | cc[1]=fCzy; cc[2]=fCzz; | |
204 | cc[3]=fCcy; cc[4]=fCcz; cc[5]=fCcc; | |
205 | cc[6]=fCey; cc[7]=fCez; cc[8]=fCec; cc[9]=fCee; | |
206 | cc[10]=fCty; cc[11]=fCtz; cc[12]=fCtc; cc[13]=fCte; cc[14]=fCtt; | |
207 | } | |
208 | ||
209 | //_____________________________________________________________________________ | |
2a941f4e | 210 | Int_t AliTRDtrack::Compare(const TObject *o) const { |
46d29e70 | 211 | |
5443e65e | 212 | // Compares tracks according to their Y2 or curvature |
46d29e70 | 213 | |
214 | AliTRDtrack *t=(AliTRDtrack*)o; | |
215 | // Double_t co=t->GetSigmaY2(); | |
216 | // Double_t c =GetSigmaY2(); | |
217 | ||
218 | Double_t co=TMath::Abs(t->GetC()); | |
219 | Double_t c =TMath::Abs(GetC()); | |
220 | ||
221 | if (c>co) return 1; | |
222 | else if (c<co) return -1; | |
223 | return 0; | |
224 | } | |
225 | ||
a819a5f7 | 226 | //_____________________________________________________________________________ |
227 | void AliTRDtrack::CookdEdx(Double_t low, Double_t up) { | |
228 | //----------------------------------------------------------------- | |
229 | // Calculates dE/dX within the "low" and "up" cuts. | |
230 | //----------------------------------------------------------------- | |
5443e65e | 231 | |
a819a5f7 | 232 | Int_t i; |
5443e65e | 233 | Int_t nc=GetNumberOfClusters(); |
a819a5f7 | 234 | |
5443e65e | 235 | Float_t sorted[kMAX_CLUSTERS_PER_TRACK]; |
236 | for (i=0; i < nc; i++) { | |
237 | sorted[i]=fdQdl[i]; | |
238 | } | |
a819a5f7 | 239 | |
240 | Int_t swap; | |
5443e65e | 241 | |
a819a5f7 | 242 | do { |
243 | swap=0; | |
244 | for (i=0; i<nc-1; i++) { | |
245 | if (sorted[i]<=sorted[i+1]) continue; | |
246 | Float_t tmp=sorted[i]; | |
247 | sorted[i]=sorted[i+1]; sorted[i+1]=tmp; | |
248 | swap++; | |
249 | } | |
250 | } while (swap); | |
251 | ||
252 | Int_t nl=Int_t(low*nc), nu=Int_t(up*nc); | |
253 | Float_t dedx=0; | |
254 | for (i=nl; i<=nu; i++) dedx += sorted[i]; | |
255 | dedx /= (nu-nl+1); | |
5443e65e | 256 | |
a819a5f7 | 257 | SetdEdx(dedx); |
258 | } | |
259 | ||
260 | ||
261 | ||
46d29e70 | 262 | //_____________________________________________________________________________ |
263 | Int_t AliTRDtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho,Double_t pm) | |
264 | { | |
265 | // Propagates a track of particle with mass=pm to a reference plane | |
266 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
267 | ||
5443e65e | 268 | |
46d29e70 | 269 | if (TMath::Abs(fC*xk - fE) >= 0.99999) { |
5443e65e | 270 | Int_t n=GetNumberOfClusters(); |
271 | if (n>4) cerr<<n<<" AliTRDtrack warning: Propagation failed !\n"; | |
46d29e70 | 272 | return 0; |
273 | } | |
274 | ||
275 | Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fY, z1=fZ; | |
5443e65e | 276 | Double_t c1=fC*x1 - fE; |
277 | if((c1*c1) > 1) return 0; | |
278 | Double_t r1=sqrt(1.- c1*c1); | |
279 | Double_t c2=fC*x2 - fE; | |
280 | if((c2*c2) > 1) return 0; | |
281 | Double_t r2=sqrt(1.- c2*c2); | |
46d29e70 | 282 | |
283 | fY += dx*(c1+c2)/(r1+r2); | |
284 | fZ += dx*(c1+c2)/(c1*r2 + c2*r1)*fT; | |
285 | ||
286 | //f = F - 1 | |
287 | Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2; | |
288 | Double_t f02= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr); | |
289 | Double_t f03=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr); | |
290 | Double_t cr=c1*r2+c2*r1; | |
291 | Double_t f12= dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr); | |
292 | Double_t f13=-dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr); | |
293 | Double_t f14= dx*cc/cr; | |
294 | ||
295 | //b = C*ft | |
296 | Double_t b00=f02*fCcy + f03*fCey, b01=f12*fCcy + f13*fCey + f14*fCty; | |
297 | Double_t b10=f02*fCcz + f03*fCez, b11=f12*fCcz + f13*fCez + f14*fCtz; | |
298 | Double_t b20=f02*fCcc + f03*fCec, b21=f12*fCcc + f13*fCec + f14*fCtc; | |
299 | Double_t b30=f02*fCec + f03*fCee, b31=f12*fCec + f13*fCee + f14*fCte; | |
300 | Double_t b40=f02*fCtc + f03*fCte, b41=f12*fCtc + f13*fCte + f14*fCtt; | |
301 | ||
302 | //a = f*b = f*C*ft | |
303 | Double_t a00=f02*b20+f03*b30,a01=f02*b21+f03*b31,a11=f12*b21+f13*b31+f14*b41; | |
304 | ||
305 | //F*C*Ft = C + (a + b + bt) | |
306 | fCyy += a00 + 2*b00; | |
307 | fCzy += a01 + b01 + b10; | |
308 | fCcy += b20; | |
309 | fCey += b30; | |
310 | fCty += b40; | |
311 | fCzz += a11 + 2*b11; | |
312 | fCcz += b21; | |
313 | fCez += b31; | |
314 | fCtz += b41; | |
315 | ||
316 | fX=x2; | |
317 | ||
318 | ||
319 | //Multiple scattering ****************** | |
320 | ||
321 | Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fY)*(y1-fY)+(z1-fZ)*(z1-fZ)); | |
322 | Double_t p2=GetPt()*GetPt()*(1.+fT*fT); | |
5443e65e | 323 | p2 = TMath::Min(p2,1e+08); // to avoid division by (1-1) for stiff tracks |
46d29e70 | 324 | Double_t beta2=p2/(p2 + pm*pm); |
325 | ||
326 | Double_t ey=fC*fX - fE, ez=fT; | |
327 | Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey; | |
328 | ||
329 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho; | |
330 | fCcc += xz*xz*theta2; | |
331 | fCec += xz*ez*xy*theta2; | |
332 | fCtc += xz*zz1*theta2; | |
333 | fCee += (2*ey*ez*ez*fE+1-ey*ey+ez*ez+fE*fE*ez*ez)*theta2; | |
334 | fCte += ez*zz1*xy*theta2; | |
335 | fCtt += zz1*zz1*theta2; | |
336 | ||
337 | ||
338 | //Energy losses************************ | |
5443e65e | 339 | if (x1 < x2) d=-d; |
46d29e70 | 340 | Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d*rho; |
ca6c93d6 | 341 | //PH SetLength(GetLength()+d); |
5443e65e | 342 | |
343 | cc = fC; | |
46d29e70 | 344 | fC*=(1.- sqrt(p2+pm*pm)/p2*dE); |
5443e65e | 345 | fE+=fX*(fC-cc); |
46d29e70 | 346 | |
347 | return 1; | |
348 | ||
349 | } | |
350 | ||
46d29e70 | 351 | //_____________________________________________________________________________ |
5443e65e | 352 | Int_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, UInt_t index) |
46d29e70 | 353 | { |
354 | // Assignes found cluster to the track and updates track information | |
355 | ||
a819a5f7 | 356 | Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2(); |
46d29e70 | 357 | r00+=fCyy; r01+=fCzy; r11+=fCzz; |
358 | Double_t det=r00*r11 - r01*r01; | |
359 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
360 | ||
361 | Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; | |
362 | Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
363 | Double_t k20=fCcy*r00+fCcz*r01, k21=fCcy*r01+fCcz*r11; | |
364 | Double_t k30=fCey*r00+fCez*r01, k31=fCey*r01+fCez*r11; | |
365 | Double_t k40=fCty*r00+fCtz*r01, k41=fCty*r01+fCtz*r11; | |
366 | ||
367 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
368 | Double_t cur=fC + k20*dy + k21*dz, eta=fE + k30*dy + k31*dz; | |
369 | if (TMath::Abs(cur*fX-eta) >= 0.99999) { | |
5443e65e | 370 | Int_t n=GetNumberOfClusters(); |
371 | if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
372 | return 0; | |
46d29e70 | 373 | } |
374 | ||
375 | fY += k00*dy + k01*dz; | |
376 | fZ += k10*dy + k11*dz; | |
377 | fC = cur; | |
378 | fE = eta; | |
379 | fT += k40*dy + k41*dz; | |
380 | ||
381 | Double_t c01=fCzy, c02=fCcy, c03=fCey, c04=fCty; | |
382 | Double_t c12=fCcz, c13=fCez, c14=fCtz; | |
383 | ||
384 | fCyy-=k00*fCyy+k01*fCzy; fCzy-=k00*c01+k01*fCzz; | |
385 | fCcy-=k00*c02+k01*c12; fCey-=k00*c03+k01*c13; | |
386 | fCty-=k00*c04+k01*c14; | |
387 | ||
388 | fCzz-=k10*c01+k11*fCzz; | |
389 | fCcz-=k10*c02+k11*c12; fCez-=k10*c03+k11*c13; | |
390 | fCtz-=k10*c04+k11*c14; | |
391 | ||
392 | fCcc-=k20*c02+k21*c12; fCec-=k20*c03+k21*c13; | |
393 | fCtc-=k20*c04+k21*c14; | |
394 | ||
395 | fCee-=k30*c03+k31*c13; | |
396 | fCte-=k30*c04+k31*c14; | |
397 | ||
398 | fCtt-=k40*c04+k41*c14; | |
399 | ||
5443e65e | 400 | Int_t n=GetNumberOfClusters(); |
401 | fIndex[n]=index; | |
402 | SetNumberOfClusters(n+1); | |
46d29e70 | 403 | |
5443e65e | 404 | SetChi2(GetChi2()+chisq); |
46d29e70 | 405 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; |
5443e65e | 406 | |
407 | return 1; | |
46d29e70 | 408 | } |
409 | ||
410 | //_____________________________________________________________________________ | |
411 | Int_t AliTRDtrack::Rotate(Double_t alpha) | |
412 | { | |
413 | // Rotates track parameters in R*phi plane | |
414 | ||
415 | fAlpha += alpha; | |
416 | ||
417 | Double_t x1=fX, y1=fY; | |
418 | Double_t ca=cos(alpha), sa=sin(alpha); | |
419 | Double_t r1=fC*fX - fE; | |
420 | ||
5443e65e | 421 | if (TMath::Abs(r1) >= 0.99999) { |
422 | Int_t n=GetNumberOfClusters(); | |
423 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !\n"; | |
424 | return 0; | |
425 | } | |
426 | ||
46d29e70 | 427 | fX = x1*ca + y1*sa; |
428 | fY=-x1*sa + y1*ca; | |
429 | fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa; | |
430 | ||
431 | Double_t r2=fC*fX - fE; | |
432 | if (TMath::Abs(r2) >= 0.99999) { | |
5443e65e | 433 | Int_t n=GetNumberOfClusters(); |
434 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !\n"; | |
46d29e70 | 435 | return 0; |
436 | } | |
437 | ||
438 | Double_t y0=fY + sqrt(1.- r2*r2)/fC; | |
439 | if ((fY-y0)*fC >= 0.) { | |
5443e65e | 440 | Int_t n=GetNumberOfClusters(); |
441 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !!!\n"; | |
46d29e70 | 442 | return 0; |
443 | } | |
444 | ||
445 | //f = F - 1 | |
446 | Double_t f00=ca-1, f32=(y1 - r1*x1/sqrt(1.- r1*r1))*sa, | |
447 | f30=fC*sa, f33=(ca + sa*r1/sqrt(1.- r1*r1))-1; | |
448 | ||
449 | //b = C*ft | |
450 | Double_t b00=fCyy*f00, b03=fCyy*f30+fCcy*f32+fCey*f33; | |
451 | Double_t b10=fCzy*f00, b13=fCzy*f30+fCcz*f32+fCez*f33; | |
452 | Double_t b20=fCcy*f00, b23=fCcy*f30+fCcc*f32+fCec*f33; | |
453 | Double_t b30=fCey*f00, b33=fCey*f30+fCec*f32+fCee*f33; | |
454 | Double_t b40=fCty*f00, b43=fCty*f30+fCtc*f32+fCte*f33; | |
455 | ||
456 | //a = f*b = f*C*ft | |
457 | Double_t a00=f00*b00, a03=f00*b03, a33=f30*b03+f32*b23+f33*b33; | |
458 | ||
459 | // *** Double_t dy2=fCyy; | |
460 | ||
461 | //F*C*Ft = C + (a + b + bt) | |
462 | fCyy += a00 + 2*b00; | |
463 | fCzy += b10; | |
464 | fCcy += b20; | |
465 | fCey += a03+b30+b03; | |
466 | fCty += b40; | |
467 | fCez += b13; | |
468 | fCec += b23; | |
469 | fCee += a33 + 2*b33; | |
470 | fCte += b43; | |
471 | ||
472 | // *** fCyy+=dy2*sa*sa*r1*r1/(1.- r1*r1); | |
473 | // *** fCzz+=d2y*sa*sa*fT*fT/(1.- r1*r1); | |
474 | ||
475 | return 1; | |
476 | } | |
477 | ||
478 | ||
46d29e70 | 479 | //_____________________________________________________________________________ |
480 | Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c) const | |
481 | { | |
a819a5f7 | 482 | /* |
483 | Double_t r00=c->GetSigmaY2(), r01=0., r11=c->GetSigmaZ2(); | |
46d29e70 | 484 | r00+=fCyy; r01+=fCzy; r11+=fCzz; |
485 | ||
486 | Double_t det=r00*r11 - r01*r01; | |
487 | if (TMath::Abs(det) < 1.e-10) { | |
488 | if (fN>4) cerr<<fN<<" AliTRDtrack warning: Singular matrix !\n"; | |
489 | return 1e10; | |
490 | } | |
491 | Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01; | |
492 | ||
493 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
494 | ||
495 | return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det; | |
a819a5f7 | 496 | */ |
497 | ||
498 | Double_t dy=c->GetY() - fY; | |
499 | Double_t r00=c->GetSigmaY2(); | |
500 | ||
501 | return (dy*dy)/r00; | |
502 | ||
46d29e70 | 503 | } |
504 | ||
505 | ||
506 | //_________________________________________________________________________ | |
507 | void AliTRDtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const | |
508 | { | |
509 | // Returns reconstructed track momentum in the global system. | |
510 | ||
511 | Double_t pt=TMath::Abs(GetPt()); // GeV/c | |
512 | Double_t r=fC*fX-fE; | |
5443e65e | 513 | |
514 | Double_t y0; | |
515 | if(r > 1) { py = pt; px = 0; } | |
516 | else if(r < -1) { py = -pt; px = 0; } | |
517 | else { | |
518 | y0=fY + sqrt(1.- r*r)/fC; | |
519 | px=-pt*(fY-y0)*fC; //cos(phi); | |
520 | py=-pt*(fE-fX*fC); //sin(phi); | |
521 | } | |
46d29e70 | 522 | pz=pt*fT; |
523 | Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha); | |
524 | py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha); | |
525 | px=tmp; | |
526 | ||
527 | } | |
528 | ||
5443e65e | 529 | //_________________________________________________________________________ |
530 | void AliTRDtrack::GetGlobalXYZ(Double_t& x, Double_t& y, Double_t& z) const | |
46d29e70 | 531 | { |
5443e65e | 532 | // Returns reconstructed track coordinates in the global system. |
533 | ||
534 | x = fX; y = fY; z = fZ; | |
535 | Double_t tmp=x*TMath::Cos(fAlpha) - y*TMath::Sin(fAlpha); | |
536 | y=x*TMath::Sin(fAlpha) + y*TMath::Cos(fAlpha); | |
537 | x=tmp; | |
538 | ||
539 | } | |
3ab6f951 | 540 | |
5443e65e | 541 | //_________________________________________________________________________ |
542 | void AliTRDtrack::ResetCovariance() { | |
543 | // | |
544 | // Resets covariance matrix | |
545 | // | |
46d29e70 | 546 | |
5443e65e | 547 | fCyy*=10.; |
548 | fCzy=0.; fCzz*=10.; | |
549 | fCcy=0.; fCcz=0.; fCcc*=10.; | |
550 | fCey=0.; fCez=0.; fCec=0.; fCee*=10.; | |
551 | fCty=0.; fCtz=0.; fCtc=0.; fCte=0.; fCtt*=10.; | |
46d29e70 | 552 | |
5443e65e | 553 | } |